We are very proud of our Fox 19BB and want it to give you
the best possible service. Please read the owners manual in its
entirety and follow its instructions to the best of your ability.
If you have any questions not covered here, please fell free
to call us at Area Code 501-646-1656.

NOTE:

The Fox 19BB has a unique design feature of being able to
turn the cylinder 90 degrees or 180 degrees from the standard
side exhaust configuration, with no additional parts required.
If you wish to have the exhaust in the rear or to the opposite
side, just pull the four cylinder head bolts, turn the cylinder
the way you wish, and install the cylinder head bolts. Be careful
that the cylinder liner also turns with the cylinder casting,
and that you do not get the ports out of position. Also be careful
that you do not damage the thin gasket between the cylinder section
and the case.

SUITABLE MODELS

The Fox 19BB is intended for all sport and scale type model
airplanes that their size and weight would fit. They are suited
to model helicopters if auxiliary cooling is provided. Your Fox
19BB also makes an excellent race car engine if a suitable heat
sink is provided. Your Fox 19BB is also well suited to model
boat use if a cool clamp is provided for the head.

WARNING

There is always the possibility you may lose control of your
model. Do not fly in any location where your model might strike
people or do property damage should this occur.

INSTALLATION

Your Fox 19BB mounts in the normal manner. If your airplane
calls for a firewall mount we recommend the Fox #50203 one piece
metal mount, as it is very rigid. If your airplane is designed
with a hardwood beam mount, be sure they are well braced between
the two beams and the beams are gusseted to the firewall, and
preferably, one to the other. Flimsy motor mounts will allow
the engine to vibrate excessively and may damage the model and
cause foaming of the fuel tank. If a cowling is used, provision
should be mode for both air inlet and outlet.

PROPELLERS TO USE

We recommend an 8" diameter, 4" or 5" pitch
propeller for most models. We recommend hardwood propellers of
maple, birch or cherry wood. We recommend you never use a metal,
fiberglass, or nylon propeller on your airplane because they
are more likely to cut off part of your hand should you have
an accident. Your Fox 19BB will run satisfactorily on a 9"
or 10" diameter propeller but the large venturi carburetor
will have practically no suction, and to get satisfactory fuel
draw the carburetor should be replaced with one having a smaller
venturi.

WARNING

Always keep clear of the propeller. It is possible for a propeller
to cut off a finger or for a piece to come off and put an eye
out.

FUEL TO USE

Your Fox 19BB should run very well on no nitro fuel in warm
weather. The no nitro fuel formula we recommend is castor oil
- 20%, propylene oxide - 2%, methanol - 76%. In cool weather
it may be necessary to go to a nitro fuel to prevent an RPM drop
when the battery wire is removed. Dukes fuel is ideal and works
better than many 10% mixes because it contains propylene oxide
which helps in idling and a detergent which helps keep the carbon
down.For rather spectacular performance you may want to try Fox
Missile Mist fuel.

WARNING

Model airplane fuel is both flammable and extremely poisonous.
Use the same safety precautions you would with a can of gasoline
or a bottle of poison.

GLOW PLUGS

Your Fox 19BB should be fitted with Fox long thread glow plugs.
For a good idle the idle bar type seems better, however, these
motors work surprisingly well on the cheaper standard variety.

TO START YOUR MOTOR

1. Mount your motor securely on a mount that does not
put a strain on the mounting lugs. #4-40 screws are the size
to use. The fuel supply should be so positioned so the fuel level
is no more than 1/2" above or below the fuel nipple. The
fuel line should not be higher than the fuel level at any point.
Use Fox medium silicone type fuel line.2. Close the throttle - adjust the idle stop screw (the
one on the top), so you can see a hairline opening in the intake
when the throttle is pushed closed.3. Holding the throttle shut, screw the low speed needle
(the one on the exhaust side) in until it seats, then back it
out 1 turn.4. Screw the high speed needle in until it seats, then
back it out 4 turns.5. Set the throttle at 1/3 open position, connect the
glow plug wire and crank counter-clockwise with a quick, snappy
flipping motion. If it does not start in a few flips, try choking
it a turn or two. It should start and run at these settings.

WARNING

A model airplane motor can get hot enough to cause a serious
burn. Do not touch the motor right after it has been running.

BREAK IN

No special break in is required. Go ahead and install it in
your airplane and fly. We do recommend you keep your carburetor
set slightly rich at all times. In the interest of good compression
and long life we have fitted your motor as tight as we dare.
In the event yours is fit too close and you have trouble with
the piston seizing (engine stops abruptly on lean), continue
to run the engine at full throttle with the high speed needle
rich enough so that it doesn't want to quit for a couple of tanks
of fuel, or until it will hold a full power setting. You should
be aware, however, that it takes about 1 hour running time to
full break in. For this period any motor is likely to stop at
idle speed, and it is really futile to try to fine tune the idle
until the motor has been run this amount of time.

WARNING

Never fly a control line model within 200 feet of power lines.
Death by electrocution is possible if your model comes near a
power line. Direct contact is not necessary.

FINE TUNING YOUR FOX 19BB CARBURETOR

The most reliable settings are those in which the lower 2/3
of the throttle range is as lean as possible without stalling
and becoming slightly rich in the 3/4 to full throttle setting.
The needle on the fuel nipple side is the high speed needle and
controls the mixture in the wide open throttle position. The
needle on the other side is the low speed needle and controls
the mixture through idle and mid-range. Both screw in to lean
and out to richen. For normal tank installations and flight conditions
we recommend that the low speed mixture adjustments be made for
maximum RPM. The high speed is adjusted by screwing the high
speed needle in until the motor obtains maximum RPM, then backing
out until the motor slows down 200 RPM.

If, after your Fox 19BB is run in, you wish to alter the mixture
contour, you can do so by working on the tip of the low speed
needle.

If the motor will not get rich enough at high speed:

File 1/64 or so off the end at a 45 degree angle.

If the motor is lean at midrange:

Sand a radius on the edge shown.

If the midrange can be made to work fine by screwing the needle
in a bit too much for a good idle:

If you mess up you have not ruined an expensive part. Try
to get it working exactly the way you want.

NOTE:

A lot of cases of the motor quitting in maneuvers can be corrected
by shortening the flopper tube. We recommend you leave a 3/4"
to 1" space between the back of your tank and the flopper
tube weight. Many cases of excessive plug failure can be traced
to power panels that do not work right. Unfortunately, there
are power panels on the market that do not work as well as they
are supposed to. If in doubt, resort to the hobby battery and
see if this corrects the problem.

Over voltage on battery (plug should glow orange, not white)
Element crumpled.
Caused by cranking with case flooded.

IN CASE OF CRASH, DO NOT TURN THE PROP OVER YET:

1st - Remove from rest of model.
2nd - Wash under hot water faucet.
3rd - Remove plug and rear cover and wash in stoddard solvent.
4th - Now check and see if it turns over freely. If so, it is
probably not hurt.

OTHERWISE, CONTINUE TO DISASSEMBLE

TO CONTINUE DISASSEMBLY:

Remove head screws, lift off head, head button and cylinder
assembly. Remove crankcase screws and remove rear cover. Slide
off the connecting rod. After removing the thrust washer you
can drive the crank back out with a wood or plastic mallet.

REASSEMBLY:

Reassembly is straightforward but be sure the wrist pin snaps
rings or seated in the piston groove and are tight. It is easy
to squeeze the snap ring too much in disassembly and when re-installed
it is not tight. If in doubt, stretch the snap ring.

FACTORY SERVICE:

We want your Fox engine to perform well for you. Technical
advice can be obtained by phoning Area Code 501-646-1656. If
your motor has become worn or crashed and you desire our factory
repair service, mail it directly to us. We will disassemble the
motor, replace all necessary parts, test run and return the motor
to you charges collect. It has not proven practical to make any
sort of estimates. We will assure you, however, that our charges
will never be more than 60% of the list price of a new motor.

GOOD LUCK AND ENJOY YOUR FOX MOTOR - IT IS ONE OF THE
BEST BUILT ANYWHERE